A problem ordering at AMAZON.com?

I tried several times to order a new book from AMAZON.com. I am coming to a close with my current reading and want to read something different.

I thoroughly enjoyed “The Bridge” by Solomon Jones and ordered his newer book, “Return of C.R.E.A.M”. It is listed for $18.68 and every time I get to check-out, the bill is $37.36 plus tax. This happened three times. The first time I tried, a book by J. California Cooper was substituted. Looking forward to Amazon prioritizing this annoying problem as it does not have a “Contact us” link.

Dear xxxxx
Your order has been successfully canceled. For your reference, here's a summary of your order:
You just canceled order #104-7415196-xxxxxxx placed on December 15, 2009.
Status: CANCELED
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1 of The Wake of the Wind: A Novel
By: J. California Cooper
Sold by: Amazon.com, LLC
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Because you only pay for items when we ship them to you, you won't be charged for any items that you cancel.

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As always,
BB